(1)2min电流做的功:
W=
5R
2500R/kW?h =0.002kW?h=0.002×3.6× 10 6 J=7200J
20台电脑的待机功率:
P=
W
t =
7200J
120s =60W
每台电脑的待机功率:
P′=
P
20 =
60W
20 =3W
故答案为:7200,3.
(1)2min电流做的功:
W=
5R
2500R/kW?h =0.002kW?h=0.002×3.6× 10 6 J=7200J
20台电脑的待机功率:
P=
W
t =
7200J
120s =60W
每台电脑的待机功率:
P′=
P
20 =
60W
20 =3W
故答案为:7200,3.